KR101228025B1 - Inking system for intaglio printing machine - Google Patents

Abstract

The system for the intaglio printing machine includes a duct 1 for supplying ink to at least the surface of the engraved optional inking cylinder 5, the selective inking cylinder corresponding to the engraving 18 so as to supply ink on the plate cylinder. The ink is supplied to the surface of the plate cylinder 16 of the intaglio printing machine via the chevron roller 17 having the. The inking system further comprises a wiping system 8 for wiping the surface of the selective inking cylinder and for recovering wiped ink into the duct 1.

Intaglio, Duct, Engraving, Relief, Plate Cylinder

Description

INKING SYSTEM FOR ENJECTION PRINTING MACHINES {INKING SYSTEM FOR INTAGLIO PRINTING MACHINE}

The present invention relates to an inking system for an intaglio printing machine for printing bills, securities such as checks, passports, IDs and other similar objects.

In the field of multicolor engraved printing, the ink is filled with the correct amount of ink in the delicate and deep engraved lines of the engraved plate to achieve excellent print quality, while at the same time transferring to the non-engraved areas of the engraved plate. It is necessary to minimize the amount of oil and to exceed the amount of ink required for filling fine engravings, thereby improving mechanical operability and reducing ink consumption.

Examples of prior art printing presses are described in US Pat. Nos. 4,516,496, 5,062,359 and 5,899,145, which are incorporated herein by reference.

In the art of intaglio printing and intaglio printing, the inking system roughly adjusts the amount of ink along the axis of the printing cylinder, but there is no means for adjustment around the outer circumferential surface of the cylinder.

For example, a more precise adjustment means is known from US Pat. No. 4,604,951, which discloses an intaglio printing machine having a conventional configuration featuring a duct having ink retention recesses having various depths corresponding to the depth of the plate. Initiate. This printing press has not been commercialized at all, and has the following disadvantages.

The machine configuration uses only the direct inking process.

The ink retention recess on the duct cylinder cannot exactly match the engraving pattern of the intaglio plate.

The duct / blade arrangement requires a continuous cylinder surface and is not compatible with the plate clamping device. Engraving plates are easier to manufacture, install and service than complete cylinders.

High rigid ink blades cannot be precisely controlled by adjusting screws.

The space between the ink blade and the duct roller makes it possible to attach a large amount of ink to the non-fragmented surface of the duct and to attach it to the non-engraved surface of the engraved plate so that no ink is saved.

If the space between the ink blade and the duct is further reduced, the blade contacts the duct, which damages the blade and the cylinder face.

Another system for improving the precision of the adhesion of the ink and for reducing the ink consumption has been developed in the prior art, for example in the publication of European Patent Publication No. 1 442 878, the contents of which are incorporated herein by reference. This patent application relates to an intaglio printer in which the selector cylinder used to attach ink to the collector cylinder is independently driven by a drive to change the inking print length of the blanket of the collector cylinder.

Another example is disclosed by reference in European Patent Publication No. 1 445 098, the contents of which are incorporated herein by reference. In this patent application, the blanket cylinder for the intaglio printing press is formed of various layers having different characteristics from each other. The layers can be carved and lipophilic and / or lipophobic, thus achieving very precise inking of the plate cylinder.

Accordingly, it is an object of the present invention to improve known machines and processes.

Another object of the present invention is to provide a printing press and a printing process that overcome the deficiencies of the prior art.

Another object of the present invention is to provide an intaglio printing press and process which is easy to operate and has excellent performance in terms of print quality and ink saving.

For this purpose, the invention is determined according to the definition of the claims.

The invention will be best understood by the description of several embodiments and the accompanying drawings.

1 shows a first embodiment of an inking system according to the invention.

2 shows a second embodiment of the inking system according to the invention with the first configuration of the printing press.

FIG. 2B shows a modification of the configuration of FIG. 2.

3 shows another configuration of a printing press having an inking system according to the present invention.

4 shows another configuration of a printing press having an inking system according to the present invention.

5 shows a multicolor configuration of a printing press having an inking system according to the present invention.

In figure 1 a first embodiment of an inking system according to the invention is shown. In this embodiment, there is a duct outlined by reference number 1, which comprises a duct roller 2, an ink control blade 3 for the duct roller 2, and an ink source 4. The duct roller supplies ink to the selective inking cylinder 5 with a carved surface. The surface of the optional inking cylinder 5 is directly engraved or preferably the cylinder has a engraving plate with engravings corresponding to the pattern to which a certain color should be supplied. In a manner known in the art, the inking cylinder comprises a pit 7, in which a clamping means (not shown) is provided for holding the plate 6 in place.

The inking system also comprises a wiping roller 8, preferably a dry wiping roller which is used to wipe the surface of the ink cylinder 5, and thus is present in the engraving of the inking cylinder 5 Only the ink remaining remains and the ink existing on the unfragmented surface of the cylinder 5 is almost completely removed.

The wiping system also includes a scraping blade 9 for scraping the surface of the wiping roller, the scraped ink being recovered from the ink source 4 as shown in FIG.

Thus, the ink supply function of the duct is separated from the ink thickness adjusting function. The duct roller 2 supplies excess ink to the selective inking cylinder 5 by the duct blade 3. The duct blade need not be provided with the adjusting screw because there is no need for axial adjustment of the ink amount. The space between the duct blade 3 and the duct roller 2 does not need to be precisely adjusted. By way of example, if the maximum required amount of ink requires a space of, for example, 20 microns, the space can be adjusted to a wide excess tolerance of, for example, 100 to 300 microns. This is because the duct roller 2 has no ink adjusting function. The duct roller 2 is preferably coated with hard rubber or plastic (eg PVC 50 ° ShD). This coating is removable from the press for maintenance or replacement, with state-of-the-art means for adjusting contact with the optional inking cylinder 5 and with liquid circulation for temperature control. In addition, a high speed automatic on / off moving unit is preferably provided which is operated at each rotation to prevent ink from being transferred to the plate near the bending position.

The optional inking cylinder 5 has an ink control function and has a plate clamping device for the engraving plate 6, which is generally a chromium nickel plate, as described above. The engraving plate 6 is in rotational contact with the duct roller 2, receives excess ink from the duct roller, and the ink is transferred to both the engraving recess of the plate 6 and the plate surface. After operation of the dry wiping roller 8, each point of the engraving plate receives the exact amount (or some excess) of ink required for the engraving printing process.

The dry wiping roller 8 is above the duct roller 2 and is in contact with the optional inking cylinder 5 and rotated in the same direction so that both surfaces travel in opposing directions. Similar to the conventional wiping unit for wiping the intaglio plate, the dry wiping roller 8 removes excess ink from the surface of the plate 6 and the residual ink is in the engraving. Excess ink is transferred to the surface of the dry wiping roller 8 and the scraping blade 9 removes the maximum amount of ink from the surface of the wiping roller 8. The removed ink may fall into the duct 1 by gravity and be recycled again.

Both the dry wiping roller 8 and the scraping blade 9 have an asynchronous axial movement to equalize the wear of the roller surface. It is preferably coated with hard rubber or plastic (eg PVC of 50 ° ShD) and equipped with temperature control (known in the art). The dry wiping roller 8 is preferably driven by an independent motor to optimize the rotational speed so as to minimize the amount of ink remaining in the unsculpted area of the optional inking plate 6. It is in the range of several microns thick. The scraping blade 9 is preferably made of steel coated with ceramic. The surface of the dry wiping roller may be coated with a layer of material that repels ink to increase the amount of recycled ink falling into the duct by the combination of gravity and centrifugal force.

In figure 2 a second embodiment of an inking system is shown. In this embodiment, the duct 10 comprises an ink chamber 11 having an ink spraying device 12 for spraying onto a duct roller acting as an optional inking cylinder 13. In this embodiment, due to the direction of rotation of the duct rollers, it is not necessary to use the duct blades as in the first embodiment, and therefore directly to the carved duct rollers (with sliced surfaces or with carved plates). Can be used to simplify configuration. Ink spraying is synchronized with the rotation of the duct rollers to prevent ink from being applied in the roller recesses in the presence of the non-fragmented areas of the duct rollers and the plate clamping configuration. On the upper side of the ink chamber 11 is a wiping system having a wiping roller 8 and a scraping blade 9. Underneath the scraping blade 9, a recovery means such as a tank 14 having a pump means 15 is provided to provide the recovered ink in the sprayed ink circuit.

In the embodiment shown in Fig. 2, the printing press shown is an indirect inking engraving printer. Therefore, the engraved duct having the engraving corresponding to the engraving of the plate cylinder 16 draws the ink of the engraving on the chablon roller 17 having the relief 18 corresponding to the portion to which the ink is to be supplied. Transfer, the relief 18 transfers the ink to the collector cylinder 19, which is then transferred to the plate of the plate cylinder 16. The same collector cylinder 19 can receive different colored inks from other inking units and chevron rollers similar to the inking units shown, although not shown in FIG. The process of indirect inking of the intaglio printing process is known per se from the prior art, for example from the aforementioned US Pat. Nos. 4,516,496, 5,062,359 and 5,899,145.

A modification of the configuration of FIG. 2 is shown in FIG. 2B. In this variant, identical elements are identified using the same reference numerals. This modification is different from the configuration of FIG. 2 in that the collector cylinder 19 of FIG. 2 is removed to form a direct inking configuration. Thus, this modification includes the duct 10 having the ink spraying device 12 on the ink chamber 11 and the duct roller. At the bottom of the spraying system is a wiping system with a wiping roller 8 and a tank 14 having a scraping blade 9 and a retrieving means, for example a pumping means 15 for scraped ink. do.

The engraved duct roller having the engraving corresponding to the engraving of the plate cylinder 16 transfers the ink in the engraving on the chevron roller 17 having the relief 18 corresponding to the portion to which the ink is supplied. The relief 18 transfers ink to the plate of the plate cylinder 16.

3 shows a configuration of a printing press having an inking system of the present invention. In this configuration, the printer has a direct inking action of the intaglio printing plate. The inking part of the printing press is disclosed in Fig. 1, in which like elements are given the same reference numerals. Thus, the duct roller 2 having the typesetting plate 6 for supplying ink to the duct 1, the duct roller 2, the duct blade 3, the plate 6 of the selective inking cylinder 5, And a wiping roller 8 for wiping the surface of the optional inking cylinder. The surface of the wiping roller 8 is scraped off by the scrap blade 9 and the scraped ink is recovered in the duct 1.

The optional inking cylinder 5 then supplies ink to the transfer roller 20 having a deformable surface to penetrate into the engravings of the plate 6, which transfer of the plate of the plate cylinder 23 of the printing press. The ink is transferred to a chevron roller 21 having a relief 22 which directly attaches ink to the engraving portion.

In the direct inking configuration as shown in FIG. 3, it is necessary to use the transfer roller 20 because of the direction of rotation of the plate cylinder 23.

Another configuration of the printing press is shown in FIG. In this configuration, the printing press is an indirect inking engraving printer. The inking system shown is similar to the inking system of FIG. 1 or 3, and like elements are given the same reference numerals. Thus, the duct roller 2 having the duct 1, the duct roller 2, the duct blade 3, the plate 6 engraved or carved for supplying ink to the surface of the optional inking cylinder 5, And a wiping roller 8 wiping the surface of the optional inking cylinder 5. The surface of the wiping roller 8 is scraped off by the scrap blade 9 and the scraped ink is recovered in the duct 2.

The optional inking cylinder 5 then supplies ink to the chevron roller 24 with relief 25, which attaches the ink to the collector cylinder 26. The collector cylinder 26 adheres the ink into the engraving 27 of the plate cylinder 28 of the printing press. In this example, plate cylinder 28 holds three plates.

The wiping unit 45, which is essentially common in the printing press art, strips away at least excess ink from the engravings and the plate surface.

The sheet 29 printed in FIG. 4 is shown, which passes through a printing nip 50 formed between the plate cylinder and the impression cylinder 51 as is common in the art of engraving printing. . Of course, the system according to the invention is also suitable for web-fed printers.

The principle of indirect inking of intaglio printing machines is known per se in the art and is disclosed, for example, in the above-mentioned U.S. Patent Nos. 4,516,496, 5,062,359 and 5,899,145, in this regard. These publications are incorporated herein by reference in this application.

The configuration of the printer disclosed in Fig. 5 corresponds to a four-color indirect inking engraving printer.

This printer comprises separate inking units 30, 31, 32, 33, each inking unit having a corresponding optional inking cylinder 34 to 37, the engravings (or the engravings of the plates they support). Has a corresponding engraving 38 on the plate cylinder 39 in accordance with the principles of the invention. Each inking unit comprises a duct roller 2, an ink source and a duct blade 3. Ink is applied to the optional inking cylinders 34, 35, 36, 37 and wiped by the wiping roller 8 in the manner described above. Each of the optional inking cylinders 34, 35, 36, 37 receives inks of different colors and has engravings corresponding to the desired patterns of the plates of the plate cylinder 39, and the ink has the chevron rollers of each inking unit ( 40, 41, 42, 43).

In this configuration, the optional inking cylinders 34, 35, 36, 37 may have only a piece pattern corresponding to the color to which this selective inking cylinder is to be transferred. Advantageously, in other embodiments, the optional inking cylinders 34, 35, 36, 37 can all be engraved in the same pattern corresponding to the entire pattern of the plate cylinder 39. In this case, the overall pattern receives different colors on the selective inking cylinders 34, 35, 36, 37, but on the respective selective inking cylinders 34, 35, 36, 37 by the chevron rollers 40-43. Ink is selected so that only the ink required for the collector cylinder 44 is transferred. The advantage of this configuration is that the selective inking cylinders are all the same to reduce the manufacturing cost.

Next, the ink of each chevron roller 40, 41, 42, 43 is transferred onto the collector cylinder 44, and the collector cylinder supplies ink to the engraving portion 38 of the plate cylinder 39. The wiping unit 45 itself, which is common in the printing press art, strips off minimal excess ink from the engraving and plate surface.

The printing process itself is then carried out on the sheet 60 passing through the printing nip 61 formed between the plate cylinder 39 and the impression cylinder 62 as is known in the printing art.

The inking system of the present invention has many advantages, such as simplicity and significant ink savings possible. Because of the wiping action at the stage of the ink duct and not on the plate cylinder where all colors of the ink are mixed by the wiping operation to make it impossible to reuse, no significant amount of ink is wasted. In this case, only a minimal excess of ink is efficiently transferred onto the plate cylinder so that only a minimal amount of ink is lost by wiping.

Of course, the foregoing embodiments are given by way of example and not by way of limitation of the invention, and many variations are possible within the scope of the claims.

For example, in the configuration of the printing press shown in FIGS. 3 to 5, it is possible to use the inking system according to FIG. 2.

Preferably, the chevron rollers are prepared in a conventional manner (chevron plate or continuous cylinder). An advantage of the present invention is that the edges of the area pattern of the chevron roller receive a minimum amount of ink, ie several microns of ink. Thus, ink does not accumulate from the edges to the recesses of the chevron plate, and is easier to clean by the operator.

Preferably, the selective inking cylinders carved in accordance with the present invention have engravings that do not correspond exactly to the engravings of the printing plate and have lines having the following characteristics.

The same pattern as that of the printing plate (except for the required mirror image, ie whether the pattern carved on the optional inking cylinder is a mirror image of the carved pattern on the printing plate).

-Engraving of the printing plate is larger than the engraving of the printing plate to ensure matching and compensation of the position tolerance.

-Depth related to the depth of the line of the printing plate. It is indeed suitable to ensure that the engraving of the selective inking cylinder has a depth, for example, about 30% greater than the depth of the engraving of the printing plate, to ensure that the appropriate amount of ink is transferred to the printing plate.

Carved using the same technology as for printing plates.

If a fine engraving pattern (depth less than tens of microns, in particular less than 10 microns) is provided in some areas of the printing plate, there is no need to form pieces at all in the corresponding areas on the optional inking cylinder (s), It is provided only for ink supply to deeper areas on the printing plate. In practice, the wiping system can be configured such that a sufficient amount of ink remains on the non-fragmented region of the corresponding selective inking cylinder to supply ink to the fine pieces on the plate cylinder.

Thus, with respect to the patterns carved on each optional inking cylinder, it should be emphasized that these carved patterns are not strictly speaking the same as the corresponding patterns on the printing plate. Thus, the phrase "corresponds" used within the scope of the present specification to describe the relationship between pieces formed on the selective inking cylinder and pieces formed on the plate cylinder has a considerable degree of similarity between the pieces. It should be interpreted to mean that there are some differences in width, depth and / or position. In addition, as described above, no pieces may be formed at all on the portion of the surface of the selective inking cylinder corresponding to the fine pieces on the plate cylinder, since the non-fragmented areas of the selective inking cylinder may not supply ink to such fine pieces. This is because a sufficient amount of ink can be retained.

In the illustrated embodiment, different proportions of cylinder diameters are shown. For example, in FIG. 3 to FIG. 5, the ratio of the chevron roller to the collector cylinder is 3 to 1, whereas in FIG. 2, the ratio is 2 to 1. This should of course not be construed as limiting, but should be construed as being possible that different configurations are possible, equivalent and selectable according to circumstances.

As mentioned above, all cylinders can be provided with directly engraved surfaces or gripping engraved plates via clamping means for engraved plates.

Claims (20)

An inking system for an intaglio printer, comprising an engraved selective inking cylinder (5; 13; 34, 35, 36, 37) with at least one duct (1, 10) for ink supply, the selective inking cylinder (10) Next, ink is supplied to the surface of the plate cylinders 16; 23; 28; 39 of the intaglio printing machine through the chevron rollers 17; 21; 24; 40, 41, 42, 43, and the chevron rollers ( 17; 21; 24; 40, 41, 42, 43 have reliefs 18; 22; 25 corresponding to the pieces 27; 38 to which ink on the plate cylinders 16; 23; 28; 39 is to be supplied. And a wiping system (8, 9) for recovering wiped ink into the duct (1; 10) while the inking system wipes the surface of the selective inking cylinder. The method of claim 1, Inking system, in which the duct (1) comprises a duct roller (2) for applying ink to the surface of the optional inking cylinder (5; 34, 35, 36, 37). 3. The method of claim 2, Inking system, wherein the duct roller (2) is coated with hard plastic or rubber. The method of claim 1, An inking system in which the duct (10) is formed by an ink chamber (11) having an ink spraying device (12) for applying ink to the surface of the selective inking cylinder (13). 5. The method of claim 4, An inking system in which the spraying device (12) is synchronized with the rotation of the selective inking cylinder (13) in order to prevent the application of ink to non-fragmented areas of the selective inking cylinder (13). The method of claim 1, An inking system wherein said optional inking cylinder (5; 13; 34, 35, 36, 37) has a engraving plate (6). The method of claim 1, Inking system, wherein the wiping system comprises a wiping roller (8). The method of claim 7, wherein Inking system, the wiping system further comprises a scraping blade (9) for scraping the surface of the wiping roller (8). The method of claim 7, wherein Inking system, wherein the wiping roller (8) is a dry wiping roller. The method of claim 7, wherein Inking system in which the wiping roller (8) rotates in the same direction as the optional inking cylinder (5; 13; 34, 35, 36, 37). The method of claim 7, wherein Inking system, wherein the wiping roller (8) is coated with hard plastic or rubber. The method of claim 7, wherein An inking system in which said wiping roller is coated with an ink repellent material. The method of claim 7, wherein Inking system, wherein said wiping roller (8) is driven by independent drive means. The method of claim 1, Inking system in which the chevron roller 17 (24; 40; 41, 42, 43) indirectly supplies ink to the surface of the plate cylinder (16; 28; 39) through the collector cylinder (19; 26; 44). . The method of claim 1, An inking system wherein said optional inking cylinder (5) supplies ink to said chevron roller (21) through a transfer cylinder (20). delete An engraved printer for printing bills, checks, securities, passports, ID sheets, or webs, comprising: at least one supply unit; Impression cylinders 51 and 62; Claims having a plate cylinder (28; 39) for holding at least one plate, wherein a printing nip (50; 61) is formed between the plate cylinder (28; 39) and the impression cylinder (51; 62). Engraving printing machine provided with an inking system according to any one of claims 1 to 15. 18. The method of claim 17, A plurality of inking systems 30, 31, 32, 33, these inking systems duct 1, wiping systems 8, 9, optional inking cylinders 34, 35, 36, 37, common collector An intaglio printing machine having chevron rollers (40, 41, 42, 43) for supplying ink to the cylinder (44). 19. The method of claim 18, Each optional inking cylinder (34, 35, 36, 37) has only a engraving pattern corresponding to the color to which the selective inking cylinder is to be transferred. 19. The method of claim 18, All optional inking cylinders (34, 35, 36, 37) have the same engraving pattern, and each chevron roller (40, 41, 42, 43) transfers only the ink required for the collector cylinder (44).

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